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  2. List of mathematical constants - Wikipedia

    en.wikipedia.org/wiki/List_of_mathematical_constants

    A mathematical constant is a key number whose value is fixed by an unambiguous definition, often referred to by a symbol (e.g., an alphabet letter), or by mathematicians' names to facilitate using it across multiple mathematical problems. [1]

  3. Mental calculation - Wikipedia

    en.wikipedia.org/wiki/Mental_calculation

    If the result of step 4 does not equal the result of step 5, then the original answer is wrong. ... 62473 × 11 = 6 6+2(8) 2+4+1(7) 4+7+1(2) 7+3(0) 3 = 687203 ...

  4. Multiplication sign - Wikipedia

    en.wikipedia.org/wiki/Multiplication_sign

    In algebra, it is a notation to resolve ambiguity (for instance, "b times 2" may be written as b⋅2, to avoid being confused with a value called b 2). This notation is used wherever multiplication should be written explicitly, such as in "ab = a⋅2 for b = 2"; this usage is also seen in English

  5. Scientific notation - Wikipedia

    en.wikipedia.org/wiki/Scientific_notation

    For comparison, the same number in decimal representation: 1.125 × 2 3 (using decimal representation), or 1.125B3 (still using decimal representation). Some calculators use a mixed representation for binary floating point numbers, where the exponent is displayed as decimal number even in binary mode, so the above becomes 1.001 b × 10 b 3 d or ...

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  7. Collatz conjecture - Wikipedia

    en.wikipedia.org/wiki/Collatz_conjecture

    For instance, the first counterexample must be odd because f(2n) = n, smaller than 2n; and it must be 3 mod 4 because f 2 (4n + 1) = 3n + 1, smaller than 4n + 1. For each starting value a which is not a counterexample to the Collatz conjecture, there is a k for which such an inequality holds, so checking the Collatz conjecture for one starting ...

  8. Lottery winner ‘shocked’ after using calculator 5 times to ...

    www.aol.com/lottery-winner-shocked-using...

    The $50 game rewards players with a multiplier of up to 500 times if they match the winning numbers. “I was going through and scratching the numbers and saw something weird,” the player told ...

  9. 5 Moves To Make To Save Money Once Your Credit Score Hits 800

    www.aol.com/5-moves-save-money-once-120926785.html

    1. Look Into Cheaper Car Insurance Rates While creditors use your score to indicate your risk of default, auto insurers may include your credit score as one factor for determining your claims risk.